I've used PAM with great success.
The directions say spray on substrate. But as I use paper substrate, I just spray the tubs directly. The directions also say to wait 15 (give or take) minutes for the PAM to dry. I leave the tubs outside for an hour minimum. Maybe I'm being over cautious, but better safe than sorry.
Then once everything is dry, I put the snake and everything else back into the tub. Tada!
If you're really worried about PAM, I've heard of keepers using human lice products to kill mites.